I also have searched the net for cannellini beans and have found little.
On the Franchi (seeds of Italy) site there is a picture of a cannellini seed packet on which it says 'Dwarf French Bean', which would imply the pods are edible.
But I have also discovered that the cannellini is a close relative of the kidney bean and requires the same treatment in cooking, that is, it must be boiled for ten minutes to remove some kind of toxin. Even the fresh shelled bean needs a ten minute boil apparently; this leads me to believe that the pods are not normally eaten.
So I would urge caution; ditch the pods and boil the beans well before adding them to your favourite recipe.
I doubt if a single helping of fresh beans will cause problems, but don't tempt fate. Eat well but eat safely!